Vehicle

Abstract

The invention provides a vehicle, and relates to the technical field of automobiles. In the vehicle, two electrodes of an input end of a first conversion power supply in a motor controller are respectively connected with two electrodes of a storage battery, and an output end of the first conversion power supply is connected with a power supply end of a vehicle control unit, so that when a power supply connected with the vehicle control unit fails, the storage battery can replace the power supply through the first conversion power supply; therefore, the vehicle control unit can still work normally when the power supply connected with the vehicle control unit fails, and the power supply continuity of the vehicle control unit is improved. In addition, the storage battery is a power supply of the motor controller, namely, the whole vehicle controller multiplexes the power supply of the motor controller as a standby power supply of the whole vehicle controller, so that the overall cost of the vehicle is reduced, and market promotion is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and in particular to a vehicle. Background Art

[0002] In recent years, the safety of electric vehicles has been a concern for practitioners and consumers. In addition to the most concerned issue of battery thermal runaway, the vehicle's driving safety has also attracted much attention.

[0003] At present, the vehicle controller is powered by a power supply. Once the power supply fails, the vehicle controller is powered off and cannot continue to monitor the vehicle condition or perform fault diagnosis and preprocessing. At the same time, many important sensors on the vehicle cannot work properly, which leads to safety hazards.

[0004] Therefore, how to improve the power supply continuity of the vehicle controller is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of this, the present invention provides a vehicle to improve the power supply continuity of the vehicle controller.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] The present application provides a vehicle, comprising: a motor controller, a battery, a power supply, a motor and a vehicle controller; wherein:

[0008] The two poles of the input end of the first conversion power supply in the motor controller are respectively connected to the two poles of the battery;

[0009] The output end of the first conversion power supply and the output end of the power supply are both connected to the power supply end of the vehicle controller;

[0010] The output end of the motor controller is connected to the power supply end of the motor.

[0011] Optionally, it further includes: a second conversion power supply; wherein:

[0012] The two poles of the input end of the second conversion power supply are connected to the two poles of the power battery in the vehicle;

[0013] Two poles of the output end of the second conversion power supply are connected to two poles of the input end of the first conversion power supply.

[0014] Optionally, the second conversion power supply includes: a transformer, a power chip, a switch tube and two voltage stabilizing circuits; wherein:

[0015] The power input pin of the power chip is connected to one end of the primary winding of the transformer, and the connection point is connected to the positive electrode of the power battery in the vehicle; the ground pin of the power chip is grounded;

[0016] The other end of the primary winding is connected to the negative electrode of the power battery through the switch tube, and the negative electrode of the power battery is grounded;

[0017] The signal output end of the power chip is connected to the control end of the switch tube, and the power chip is used to control the switch tube to be alternately turned on and off when the power chip is in a working state;

[0018] Two ends of the first secondary winding of the transformer are respectively connected to a power input pin and a ground pin of the power chip;

[0019] Two ends of the second secondary winding of the transformer are respectively connected to two poles of the input end of the first conversion power supply in the motor controller in the vehicle;

[0020] The first voltage stabilizing circuit is arranged between two ends of the first secondary winding, and the second voltage stabilizing circuit is arranged between two ends of the second secondary winding.

[0021] Optionally, it also includes: a current sampling circuit; wherein:

[0022] The current sampling circuit is used to sample the current of the primary winding and transmit the sampling result to the primary current detection pin of the power chip;

[0023] The power chip is used to perform fault detection on the second conversion power supply according to the current of the primary winding.

[0024] Optionally, the current sampling circuit includes: a first sampling resistor and a first filtering circuit; wherein:

[0025] The first sampling resistor is connected in series with the switch tube, one end of the first filter circuit is connected to: the connection point between the first sampling resistor and the switch tube, and the other end of the first filter circuit is connected to the primary current detection pin of the power chip.

[0026] Optionally, it also includes: a voltage sampling circuit; wherein:

[0027] The voltage sampling circuit is used to sample the voltage at both ends of the second secondary winding and transmit the voltage sampling result to the output voltage feedback pin of the power chip;

[0028] The power chip is used to perform negative feedback adjustment on the duty cycle of the alternating on and off of the switch tube according to the voltage sampling result, so as to stabilize the voltage at both ends of the second secondary winding at a set voltage.

[0029] Optionally, the voltage sampling circuit includes: a second sampling resistor, a third sampling resistor, a controllable voltage source, an optical coupler, a first capacitor, a first resistor, a second resistor, and a third resistor; wherein:

[0030] One end of the second sampling resistor is connected to the high potential end of the second secondary winding, and one end of the third sampling resistor is grounded;

[0031] The other end of the second sampling resistor is connected to the other end of the third sampling resistor, and the connection point is connected to the reference electrode of the controllable voltage-stabilizing source;

[0032] The cathode of the controllable voltage-stabilizing source is connected to the output end of the primary side of the optocoupler, the input end of the primary side of the optocoupler is connected to the high potential end of the second secondary winding through the first resistor, and the anode of the controllable voltage-stabilizing source is grounded;

[0033] The second resistor is connected in parallel with the primary side of the optocoupler;

[0034] One end of the first capacitor is connected to: a connection point between the second sampling resistor and the third sampling resistor, and the other end of the first capacitor is connected to: an output end of the primary side of the optocoupler;

[0035] The input end of the secondary side of the optical coupler is connected to one end of the third resistor, and the connection point is connected to the output voltage feedback pin;

[0036] The other end of the third resistor receives the supply voltage, and the output end of the secondary side of the optocoupler is grounded.

[0037] Optionally, it further includes: an absorption circuit and a first protection circuit; wherein:

[0038] The absorption circuit is used to absorb the peak voltage generated by the switch tube at the moment of shutting down;

[0039] The first protection circuit is used to absorb the overvoltage at both ends of the switch tube.

[0040] Optionally, it also includes: a starting resistor and a third voltage stabilizing circuit; wherein:

[0041] The power input pin of the power chip is connected to one end of the primary winding of the transformer through the starting resistor;

[0042] The input end of the third voltage stabilizing circuit is connected to the power input pin, and the output end of the third voltage stabilizing circuit is connected to the ground pin.

[0043] Optionally, it further includes: a current limiting resistor, a first anti-reverse circuit, a second anti-reverse circuit and a second protection circuit; wherein:

[0044] The power input pin is connected to the output end of the first anti-reverse circuit through the current limiting resistor, and the input end of the first anti-reverse circuit is connected to the high potential end of the first secondary winding;

[0045] The second protection circuit is connected in parallel with the first anti-reverse circuit; the second protection circuit is used to absorb the overvoltage between the two ends of the first anti-reverse circuit;

[0046] The input end of the second anti-reverse circuit is connected to the high potential end of the second secondary winding, and the output end of the second anti-reverse circuit is connected to the positive electrode of the input end of the first conversion power supply.

[0047] It can be seen from the above technical solution that the present invention provides a vehicle. In the vehicle, since the two poles of the input end of the first conversion power supply in the motor controller are respectively connected to the two poles of the battery, and the output end of the first conversion power supply is connected to the power supply end of the vehicle controller, when the power supply connected to the vehicle controller fails, the battery can replace the power supply through the first conversion power supply to supply power to the vehicle controller, so that the vehicle controller can still work normally when the power supply connected to it fails, thereby improving the power supply continuity of the vehicle controller. In addition, since the battery is the power supply of the motor controller, that is, the vehicle controller reuses the power supply of the motor controller as its own backup power supply, so the overall cost of the vehicle is reduced, which is conducive to market promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0049] Figure 1 and Figure 2 The schematic diagrams are respectively the structural diagrams of two implementation modes of the vehicle provided in the embodiments of the present application;

[0050] Figure 3-Figure 11 They are schematic structural diagrams of nine implementation modes of the second conversion power supply 250 provided in the embodiments of the present application. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] In this application, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0053] In order to improve the power supply continuity of the vehicle controller, the embodiment of the present application provides a vehicle, whose specific structure is as follows Figure 1 As shown, it specifically includes: a motor controller 210, a battery 220, a power supply 230, a motor M and a vehicle controller 240.

[0054] The two poles of the input end of the first conversion power supply 211 in the motor controller 210 are respectively connected to the two poles of the battery 220. The output end of the first conversion power supply 211 and the output end of the power supply 230 are both connected to the power supply end of the vehicle controller 240. The vehicle controller 240 is used to communicate with other control units. Other control units include an on-board charger (OBC), a battery management system (BMS), etc.

[0055] The output terminal of the motor controller 210 is connected to the power supply terminal of the motor M.

[0056] Specifically, if Figure 1As shown, the motor controller 210 includes: a first conversion power supply 211, a controller 212, a driving power supply 213, a gate driving module 214, a high-voltage DC bus capacitor Cc, and a power converter 215. The input side of the power converter 215 is connected to the power battery, and the output side of the power converter 215 is connected to the power supply end of the motor M. The control ends of each power device in the power converter 215 are respectively connected to the controller 212 through each driving unit in the gate driving module 214. The output end of the first conversion power supply 211 is respectively connected to the power supply end of the controller 212 and the input end of the driving power supply 213, and the output end of the driving power supply 213 is respectively connected to the power supply end of each driving unit in the gate driving module 214. The driving power supply 213 is used to convert the output voltage of the first conversion power supply 211 into the working voltage of each driving unit. The high-voltage DC bus capacitor Cc is connected in parallel to the input side of the power converter 215.

[0057] Optionally, the controller 212 may be a microprocessor. In practical applications, this includes but is not limited to this. No specific limitation is made here and it may be determined according to specific circumstances, all of which are within the scope of protection of this application.

[0058] Optionally, the power converter 215 may be a DC / DC converter or a DC / AC converter, which is not specifically limited here and may depend on the type of the motor M.

[0059] In practical applications, the AC side of the DC / AC converter may include three phases or a single phase, which is not specifically limited here and may be determined according to the specific situation, and is within the protection scope of this application. When the AC side of the DC / AC converter includes three phases, the DC / AC converter may include six power devices, and the gate drive module 214 includes six drive units.

[0060] It should be noted that the first conversion power supply 211 , the driving power supply 213 , the gate driving module 214 , and the DC / AC converter are already very mature technologies in the prior art and will not be described in detail here.

[0061] Since the two poles of the input end of the first conversion power supply in the motor controller 210 are respectively connected to the two poles of the battery 220, and the output end of the first conversion power supply is connected to the power supply end of the vehicle controller 240, when the power supply 230 connected to the vehicle controller 240 fails, the battery 220 can replace the power supply 230 through the first conversion power supply to supply power to the vehicle controller 240, so that the vehicle controller 240 can still work normally when the power supply 230 connected to it fails, thereby improving the power supply continuity of the vehicle controller 240. Since the vehicle controller 240 is connected to the OBC, BMS and other control units in communication, it can continue to monitor the vehicle condition, realize fault diagnosis and processing, and thus improve the safety of the vehicle. In addition, since the battery 220 is the power supply of the motor controller 210, that is, the vehicle controller 240 reuses the power supply of the motor controller 210 as its own backup power supply, so the overall cost of the vehicle is reduced, which is conducive to market promotion.

[0062] Another embodiment of the present application provides another implementation of a vehicle, and its specific structure is as follows: Figure 2 As shown, this embodiment, based on the above embodiment, further includes: a second conversion power supply 250.

[0063] The two poles of the input end of the second conversion power supply 250 are connected to the two poles of the power battery in the vehicle; the two poles of the output end of the second conversion power supply 250 are connected to the two poles of the input end of the first conversion power supply.

[0064] In this embodiment, since the two poles of the output end of the second conversion power supply 250 are connected to the two poles of the input end of the first conversion power supply, when the battery 220 fails, the second conversion power supply 250 can replace the battery 220 to supply power to the first conversion power supply, that is, to the motor controller 210, thereby improving the power supply continuity of the motor controller 210, thereby further improving the safety of the vehicle.

[0065] Another embodiment of the present application provides a specific implementation of the second conversion power supply 250, and its specific structure is as follows: Figure 3 As shown, it specifically includes: a transformer 10, a power chip 20, a switch tube M and two voltage stabilizing circuits 30 and 40. The connection relationship between the various components is as follows:

[0066] The power input pin VDD of the power chip 20 is connected to one end of the primary winding TX1 of the transformer 10, and the connection point is connected to the positive electrode HV+ of the power battery in the vehicle. The ground pin GND of the power chip 20 is grounded, that is, the high-voltage ground HGND. The other end of the primary winding TX1 is connected to the negative electrode HV- of the power battery through the switch tube M, and the negative electrode HV- of the power battery is grounded, that is, the high-voltage ground HGND.

[0067] The signal output terminal OUT of the power chip 20 is connected to the control terminal of the switch tube M.

[0068] Optionally, the switch tube M may be a MOS tube or an IGBT. In practical applications, this includes but is not limited to these. No specific limitation is made here and it may be determined according to specific circumstances. All of these are within the protection scope of this application.

[0069] The two ends of the first secondary winding TX2 of the transformer 10 are respectively connected to the power input pin VDD and the ground pin GND of the power chip 20. When the power input pin VDD and the ground pin GND of the power chip 20 are connected to power, the power chip 20 enters the working state.

[0070] Two ends of the second secondary winding TX3 of the transformer 10 serve as two poles of the output end of the second conversion power supply 250 , and are respectively connected to two poles of the input end of the first conversion power supply 211 in the motor controller 210 in the vehicle.

[0071] The first voltage stabilizing circuit 30 is disposed between two ends of the first secondary winding TX2, and the low potential end of the first secondary winding TX2 is grounded, ie, the high voltage ground HGND. The first voltage stabilizing circuit 30 is used to keep the voltage at two ends of the first secondary winding TX2 stable.

[0072] In a specific example, the specific structure of the first voltage stabilizing circuit 30 is as follows: Figure 3 As shown, it specifically includes: a second capacitor C2, two ends of the second capacitor C2 are respectively connected to two ends of the first secondary winding TX2, and the second capacitor C2 is used to keep the voltage at two ends of the first secondary winding TX2 stable.

[0073] The above example only shows a specific implementation of the first voltage stabilizing circuit 30. In practical applications, including but not limited to this, as long as the circuit can keep the voltage across the first secondary winding TX2 stable, it is within the protection scope of this application. No specific limitation is made here and it can be determined according to the specific situation.

[0074] The second voltage stabilizing circuit 40 is disposed between two ends of the second secondary winding TX3, and the low potential end of the second secondary winding TX3 is grounded, ie, the low voltage ground LGND. The second voltage stabilizing circuit 40 is used to keep the voltage at two ends of the second secondary winding TX3 stable.

[0075] In a specific example, the specific structure of the second voltage stabilizing circuit 40 is as follows: Figure 3 As shown, it specifically includes: a third capacitor C3 and a fourth capacitor C4, the two ends of the third capacitor C3 are respectively connected to the two ends of the second secondary winding TX3, the two ends of the fourth capacitor C4 are respectively connected to the two ends of the second secondary winding TX3, and the third capacitor C3 and the fourth capacitor C4 are both used to keep the voltage at the two ends of the first secondary winding TX2 stable.

[0076] The above example only shows a specific implementation of the second voltage stabilizing circuit 40. In practical applications, including but not limited to this, as long as the circuit can keep the voltage across the second secondary winding TX3 stable, it is within the protection scope of this application. No specific limitation is made here and it can be determined according to the specific situation.

[0077] Since the power input pin VDD of the power chip 20 is connected to the positive electrode HV+ of the power battery in the vehicle and the ground pin GND is connected to the negative electrode HV- of the power battery, the high-voltage direct current of the power battery supplies power to the power chip 20, so that the power chip 20 enters the working state.

[0078] When the power chip 20 enters the working state, the power chip 20 outputs a control signal to the switch tube M through the output pin OUT to control the switch tube M to be alternately turned on and off.

[0079] In a specific example, the control signal output by the output pin OUT of the power chip 20 is a PWM signal. A high level in the PWM signal can turn on the switch tube M, and a low level in the PWM signal can turn off the switch tube M.

[0080] The above example only shows a specific implementation of the control signal output by the output pin OUT of the power chip 20. In practical applications, including but not limited to this, no specific limitation is made here and it can be determined according to the specific situation and is within the protection scope of this application.

[0081] Since the power chip 20 controls the switch tube M to be alternately turned on and off when it is in working state, that is, the voltage at both ends of the primary winding YX1 of the transformer 10 changes alternately, the transformer 10 forms a magnetic field to transfer energy, that is, the energy is transferred to the two secondary windings TX2 and TX3 of the transformer 10. Therefore, the first secondary winding TX2 provides a stable voltage to the power chip 20 through the first voltage stabilizing circuit 30, and the second secondary winding TX3 provides a stable voltage to the first conversion power supply 211 in the motor controller 210 in the vehicle through the second voltage stabilizing circuit 40.

[0082] Since the first secondary winding TX2 provides a stable voltage to the power chip 20, the transformer 10 can continuously form a magnetic field and transfer energy, so that the second secondary winding TX3 can continuously output a stable voltage, that is, the second conversion power supply can work normally, so that when the battery 220 in the vehicle fails, the second conversion power supply can supply power to the first conversion power supply, thereby reducing the possibility of failure of the first conversion power supply, that is, reducing the possibility of failure of the motor controller 210.

[0083] Another embodiment of the present application provides another implementation of the second conversion power supply 250, and its specific structure is as follows: Figure 4As shown, this embodiment, based on the above embodiment, further includes: a fuse Fuse. The connection relationship between this device and other devices is specifically described as follows:

[0084] One end of the fuse Fuse is connected to: a connection point between the power input pin VDD of the power chip 20 and the primary winding TX1 of the transformer 10 , and the other end of the fuse Fuse is connected to: a positive electrode HV+ of the power battery.

[0085] In this embodiment, by adding a fuse Fuse, when the current flowing through the fuse Fuse is too large, the connection between the power input pin VDD of the power chip 20 and the power battery and the primary winding TX1 of the transformer 10 and the power battery can be disconnected, thereby reducing the possibility of damage to the power chip 20 and the transformer 10, thereby improving the safety of the power chip 20 and the transformer 10.

[0086] Another embodiment of the present application provides another implementation of the second conversion power supply 250, and its specific structure is as follows: Figure 5 ( Figure 5 Only in Figure 4 As shown in the figure, this embodiment, based on the above embodiment, further includes: a current sampling circuit 50. The connection relationship between this device and other devices is specifically described as follows:

[0087] The current sampling circuit 50 is used to sample the current of the primary winding TX1 and transmit the sampling result to the primary current detection pin CS of the power chip 20. The power chip 20 is used to perform fault detection on the second conversion power supply 250 according to the current of the primary winding TX1. The power chip 20 is already very mature in the prior art for performing fault detection. Here, only a brief description of the fault detection is given. The specific process is as follows:

[0088] When the current of the primary winding TX1 is greater than the first preset value, it is determined that a short circuit fault occurs in the primary side of the second conversion power supply 250. At this time, the connection between the power battery and the second conversion power supply 250 is cut off to avoid damage to the second conversion power supply 250. When the current of the primary winding TX1 is less than the second preset value, it is determined that an open circuit fault occurs in the second conversion power supply. At this time, the connection between the power battery and the second conversion power supply 250 is cut off to avoid damage to the second conversion power supply 250. When the current of the primary winding TX1 is less than or equal to the first preset value and greater than or equal to the second preset value, it is determined that the second conversion power supply 250 is not faulty.

[0089] The current of the primary winding TX1 is greater than the first preset value, indicating that the current of the primary winding TX1 is large. Conversely, the current of the primary winding TX1 is less than or equal to the first preset value, indicating that the current of the primary winding TX1 is not large. In practical applications, the first preset value is set according to actual conditions and is not specifically limited here.

[0090] The current of the primary winding TX1 is less than the second preset value, indicating that the current of the primary winding TX1 is very small. On the contrary, the current of the primary winding TX1 is greater than or equal to the second preset value, indicating that the current of the primary winding TX1 is not very small. In practical applications, the second preset value is set according to actual conditions and is not specifically limited here.

[0091] It should be noted that how to cut off the connection between the power battery and the second conversion power source 250 is already very mature in the prior art and will not be described in detail here.

[0092] In this embodiment, the current of the primary winding TX1 is sampled by the current sampling circuit 50, so that the power chip 20 can perform fault detection on the second conversion power supply 250 according to the current of the primary winding TX1, thereby reducing the possibility of damage to the second conversion power supply 250 and further improving the safety of the second conversion power supply 250.

[0093] Another embodiment of the present application provides an implementation of a current sampling circuit 50, whose specific structure is as follows: Figure 5 As shown, it specifically includes: a first sampling resistor Rc1 and a first filter circuit 51. The connection relationship between each circuit / device is specifically as follows:

[0094] The first sampling resistor Rc1 is connected in series with the switch tube M, one end of the first filter circuit 51 is connected to: the connection point of the first sampling resistor Rc1 and the switch tube M, and the other end of the first filter circuit 51 is connected to the primary current detection pin CS of the power chip 20. The first filter circuit 51 is used to filter out the AC current in the sampled current of the primary winding TX1 to improve the accuracy of fault detection of the power chip 20.

[0095] In a specific example, if Figure 5 As shown, the first filter circuit 51 includes: a fourth resistor R4 and a fifth capacitor C5. The fourth resistor R4 is connected to: the connection point of the first sampling resistor Rc1 and the switch tube M. The other end of the fourth resistor R4 is connected to one end of the fifth capacitor C5, and the connection point is connected to the primary current detection pin CS of the power chip 20. The other end of the fifth capacitor C5 is grounded, that is, the high voltage ground HGND.

[0096] The above is only a specific implementation of the first filtering circuit 51. In practical applications, including but not limited to this, no specific limitation is made here, and it can be determined according to specific circumstances, all of which are within the protection scope of this application.

[0097] The above is only one implementation of the current sampling circuit 50. In practical applications, including but not limited to this, as long as the circuit can implement current sampling, it is within the protection scope of this application, which can be determined according to specific circumstances.

[0098] Another embodiment of the present application provides another implementation of the second conversion power supply 250, and its specific structure is as follows: Figure 6 ( Figure 6 Only in Figure 5 As shown in the figure, this embodiment, based on the above embodiment, further includes: a voltage sampling circuit 60. The connection relationship between this device and other devices is specifically described as follows:

[0099] The voltage sampling circuit 60 is used to sample the voltage across the second secondary winding TX3 and transmit the voltage sampling result to the output voltage feedback pin FB of the power chip 20. The power chip 20 is used to perform negative feedback adjustment on the duty cycle of the alternating on and off of the switch tube M according to the voltage sampling result, so that the voltage across the second secondary winding TX3 is stabilized at the set voltage. The power chip 20 performs negative feedback adjustment on the duty cycle of the alternating on and off of the switch tube M, which is very mature in the prior art and is only briefly described here. The specific process is as follows:

[0100] When the voltage sampling result is greater than the threshold voltage, that is, when the voltage across the second secondary winding TX3 is greater than the set voltage, the duty cycle of the alternating on and off of the switch tube M is reduced. Since the reduction in the duty cycle of the alternating on and off of the switch tube M is equivalent to a reduction in the conduction time of the switch tube M, the voltage across the primary winding TX1 of the transformer 10 is reduced, thereby reducing the voltage across the second secondary winding TX3.

[0101] When the voltage sampling result is less than the threshold voltage, that is, when the voltage across the second secondary winding TX3 is less than the set voltage, the duty cycle of the alternating on and off of the switch tube M increases. Since the increase in the duty cycle of the alternating on and off of the switch tube M is equivalent to an increase in the conduction time of the switch tube M, the voltage across the primary winding TX1 of the transformer 10 increases, thereby increasing the voltage across the second secondary winding TX3.

[0102] Since the voltage across the second secondary winding TX3 decreases when the voltage across the second secondary winding TX3 is greater than the set voltage, and increases when the voltage across the second secondary winding TX3 is less than the set voltage, the voltage across the second secondary winding TX3 is finally stabilized at the set voltage.

[0103] In this embodiment, the voltage across the second secondary winding TX3 is sampled by the voltage sampling circuit 60, so that the power chip 20 can perform negative feedback adjustment on the alternating on-off duty cycle of the switch tube M according to the voltage sampling result, so that the voltage across the second secondary winding TX3 is stabilized at the set voltage, thereby improving the stability of the voltage provided by the second conversion power supply 250.

[0104] Another embodiment of the present application provides an implementation of a voltage sampling circuit 60, and its specific structure is as follows: Figure 6 As shown, it specifically includes: a second sampling resistor Rc2, a third sampling resistor Rc3, a controllable voltage source 61, an optical coupler 62, a first capacitor C1, a first resistor R1, a second resistor R2, and a third resistor R3. The connection relationship between the components is specifically described as follows:

[0105] One end of the second sampling resistor Rc2 is connected to the high potential end of the second secondary winding TX3, and one end of the third sampling resistor Rc3 is grounded, that is, the low voltage ground LGND. The other end of the second sampling resistor Rc2 is connected to the other end of the third sampling resistor Rc3, and the connection point is connected to the reference electrode of the controllable voltage-stabilizing source 61. The cathode of the controllable voltage-stabilizing source 61 is connected to the output end of the primary side of the optical coupler 62, and the input end of the primary side of the optical coupler 62 is connected to the high potential end of the second secondary winding TX3 through the first resistor R1, and the anode of the controllable voltage-stabilizing source 61 is grounded, that is, the low voltage ground LGND. The second resistor R2 is connected in parallel with the primary side of the optical coupler 62. One end of the first capacitor C1 is connected to: the connection point of the second sampling resistor Rc2 and the third sampling resistor Rc3, and the other end of the first capacitor C1 is connected to: the output end of the primary side of the optical coupler 62. The input end of the secondary side of the optical coupler 62 is connected to one end of the third resistor R3, and the connection point is connected to the output voltage feedback pin FB of the power chip 20. The other end of the third resistor R3 receives the supply voltage V0 , and the output end of the secondary side of the optical coupler 62 is grounded, ie, the low voltage ground LGND.

[0106] Optionally, the controllable voltage regulator 61 may be a TL431. In practical applications, this includes but is not limited to this. No specific limitation is made here and it may be determined according to specific circumstances. All of these are within the protection scope of this application.

[0107] When the voltage across the second secondary winding TX3 is greater than the set voltage, the output voltage of the controllable voltage regulator 61 is greater than the reference voltage, the current flowing through the primary side of the optocoupler 62 increases, and thus the current flowing through the secondary side of the optocoupler 62 increases, and then the voltage received by the output voltage feedback pin FB of the power chip 20 is greater than the threshold voltage.

[0108] When the voltage across the second secondary winding TX3 is lower than the set voltage, the output voltage of the controllable voltage regulator 61 is lower than the reference voltage, the current flowing through the primary side of the optocoupler 62 decreases, and the current flowing through the secondary side of the optocoupler 62 decreases, and the voltage received by the output voltage feedback pin FB of the power chip 20 is lower than the threshold voltage.

[0109] The above is only a specific implementation of the voltage sampling circuit 60. In practical applications, including but not limited to this, no specific limitation is made here. As long as the circuit can realize voltage sampling, it is within the protection scope of this application, which can be determined according to the specific situation.

[0110] Another embodiment of the present application provides another implementation of the second conversion power supply 250, and its specific structure is as follows: Figure 7 ( Figure 7 Only in Figure 6 As shown in the figure, this embodiment, based on the above embodiment, further includes: an absorption circuit 70 and a first protection circuit 80. The connection relationship between this device and other devices is specifically described as follows:

[0111] The absorption circuit 70 is used to absorb the peak voltage generated by the switch tube M at the moment of shutting down to prevent the switch tube M from being broken down and damaged. The first protection circuit 80 is used to absorb the overvoltage at both ends of the switch tube M to prevent the switch tube M from being broken down and damaged.

[0112] In a specific example, if Figure 7 As shown, the absorption circuit 70 includes: a fifth resistor R5, a first diode D1 and a sixth capacitor C6, the anode of the first diode D1 is connected to the input end of the switch tube M, the cathode of the first diode D1 is respectively connected to one end of the sixth capacitor C6 and one end of the fifth resistor R5, and the other end of the sixth capacitor C6 and the other end of the fifth resistor R5 are both connected to the high potential end of the primary winding TX1 of the transformer 10.

[0113] It should be noted that the fifth resistor R5, the first diode D1 and the sixth capacitor C6 form an RCD absorption circuit, and the RCD absorption circuit is very mature in the prior art, and its working principle will not be described in detail here.

[0114] The above example only shows a specific implementation of the absorption circuit 70. In practical applications, including but not limited to this, as long as the circuit can absorb the peak voltage generated by the switch tube M at the moment of shutdown, it is within the protection scope of this application. No specific limitation is made here and it can be determined according to the specific situation.

[0115] In a specific example, if Figure 7As shown, the first protection circuit 80 includes: a sixth resistor R6 and a seventh capacitor C7. The sixth resistor R6 and the seventh capacitor C7 are connected in series, and the series branch formed is connected in parallel with the switch tube M.

[0116] The above example only shows a specific implementation of the first protection circuit 80. In practical applications, including but not limited to this, as long as the circuit can switch the overvoltage at both ends of the tube M, it is within the protection scope of this application. No specific limitation is made here and it can be determined according to the specific situation.

[0117] In this embodiment, by adding the absorption circuit 70 and the first protection circuit 80, the peak voltage generated by the switch tube M at the moment of shutdown and the overvoltage at both ends of the switch tube M can be absorbed, thereby preventing the switch tube M from being broken down and damaged, thereby improving the safety of the second conversion power supply.

[0118] Another embodiment of the present application provides another implementation of the second conversion power supply 250, and its specific structure is as follows: Figure 8 ( Figure 8 Only in Figure 7 As shown in the figure, this embodiment, based on the above embodiment, further includes: a starting resistor Rstar and a third voltage stabilizing circuit 90. The connection relationship between this device and other devices is specifically described as follows:

[0119] The power input pin VDD of the power chip 20 is connected to one end of the primary winding TX1 of the transformer 10 through the start-up resistor Rstar. The input end of the third voltage stabilizing circuit 90 is connected to the power input pin VDD, and the output end of the third voltage stabilizing circuit 90 is connected to the ground pin GND.

[0120] Usually, the resistance of the starting resistor Rstar is relatively large, so most of the high voltage of the power battery is borne by the starting resistor Rstar, and a small part is borne by the power chip 20, so as to reduce the possibility of the power chip 20 being damaged due to overvoltage.

[0121] Normally, the reverse conduction voltage of the third voltage stabilizing circuit 90 is the operating voltage of the power chip 20. In other words, the third voltage stabilizing circuit 90 stabilizes the voltage between the power input pin VDD and the ground pin GND of the power chip 20 at the operating voltage of the power chip 20, thereby further reducing the possibility of the power chip 20 being damaged due to overvoltage.

[0122] In a specific example, if Figure 8 As shown, the third voltage stabilizing circuit 90 includes a voltage stabilizing diode Z. The cathode of the voltage stabilizing diode Z is connected to the power input pin VDD of the power chip 20 , and the anode of the voltage stabilizing diode Z is connected to the ground pin GND of the power chip 20 .

[0123] The above example only shows one implementation of the third voltage stabilizing circuit 90. In practical applications, including but not limited to this, no specific limitation is made here and it may be determined according to the specific circumstances, all of which are within the protection scope of this application.

[0124] In this embodiment, by adding the starting resistor Rstar, most of the high voltage of the power battery is borne by the starting resistor Rstar, and a small part is borne by the power chip 20, thereby reducing the possibility of damage to the power chip 20 due to overvoltage. By adding the third voltage stabilizing circuit 90, the voltage between the power input pin VDD and the ground pin GND of the power chip 20 is stabilized at the operating voltage of the power chip 20, thereby further reducing the possibility of damage to the power chip 20 due to overvoltage.

[0125] Another embodiment of the present application provides another implementation of the second conversion power supply 250, and its specific structure is as follows: Fig. 9 ( Fig. 9 Only in Figure 8 As shown in the figure, this embodiment, based on the above embodiment, further includes: a current limiting resistor Rx, a first anti-reverse circuit 100, a second anti-reverse circuit 110 and a second protection circuit 120. The connection relationship between this device and other devices is as follows:

[0126] The power input pin VDD of the power chip 20 is connected to the output end of the first anti-reverse circuit 100 through the current limiting resistor Rx, and the input end of the first anti-reverse circuit 100 is connected to the high potential end of the first secondary winding TX2. The second protection circuit 120 is connected in parallel with the first anti-reverse circuit 100. The input end of the second anti-reverse circuit 110 is connected to the high potential end of the second secondary winding TX3, and the output end of the second anti-reverse circuit 110 is connected to the positive electrode of the input end of the first conversion power supply.

[0127] The second protection circuit 120 is used to absorb the overvoltage between the two ends of the first anti-reverse circuit 100 to prevent the first anti-reverse circuit 100 from being damaged due to reverse breakdown.

[0128] In a specific example, if Fig. 9 As shown, the first anti-reverse circuit 100 includes: a second diode D2. The cathode of the second diode D2 serves as the output end of the first anti-reverse circuit 100, and the anode of the second diode D2 serves as the input end of the first anti-reverse circuit 100.

[0129] The above example only shows one implementation of the first anti-reverse circuit 100. In practical applications, including but not limited to this, no specific limitation is made here and it may be determined according to the specific situation, all of which are within the protection scope of this application.

[0130] In a specific example, if Fig. 9As shown, the second anti-reverse circuit 110 includes: a third diode D3. The cathode of the third diode D3 serves as the output end of the second anti-reverse circuit 110, and the anode of the third diode D3 serves as the input end of the second anti-reverse circuit 110.

[0131] In practical applications, the third diode D3 is preferably a Schottky diode.

[0132] The above example only shows one implementation of the second anti-reverse circuit 110. In practical applications, including but not limited to this, no specific limitation is made here and it can be determined according to the specific situation, all of which are within the protection scope of this application.

[0133] In a specific example, if Fig. 9 As shown, the second protection circuit 120 includes: a seventh resistor R7 and an eighth capacitor C8. The seventh resistor R7 and the eighth capacitor C8 are connected in series, and the series branch formed is connected in parallel with the first anti-reverse circuit 100.

[0134] The above example only shows a specific implementation of the second protection circuit 120. In practical applications, including but not limited to this, as long as the circuit can prevent overvoltage at both ends of the first anti-reverse circuit 100, it is within the protection scope of this application. No specific limitation is made here and it can be determined according to the specific situation.

[0135] This embodiment reduces the current flowing through the first anti-reverse circuit 100 by adding a current limiting resistor Rx, thereby improving the safety of the second conversion power supply. This embodiment adds the first anti-reverse circuit 100 so that the high voltage of the power battery cannot flow into the first secondary winding TX2, thereby reducing the possibility of failure of the second conversion power supply and further improving the safety of the second conversion power supply. This embodiment adds the second protection circuit 120 so that the overvoltage between the two ends of the first anti-reverse circuit 100 can be absorbed, thereby preventing the first anti-reverse circuit 100 from being damaged by reverse breakdown. This embodiment adds the second anti-reverse circuit 110 so that the current of the voltage conversion power supply does not flow into the second conversion power supply, thereby improving the safety of the second conversion power supply.

[0136] Another embodiment of the present application provides another implementation of the second conversion power supply 250, and its specific structure is as follows: Fig.10 ( Fig.10 Only in Fig. 9 As shown in the figure, this embodiment, based on the above embodiment, further includes: a second filtering circuit 130. The connection relationship between this device and other devices is specifically described as follows:

[0137] The second filter circuit 130 is disposed between two poles of the power battery, and is used to filter the voltage at both ends of the power battery to ensure the stability of the voltage at both ends of the power battery.

[0138] In a specific example, if Fig.10 As shown, the second filter circuit 130 includes: a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11 and a twelfth capacitor C12. The ninth capacitor C9 and the tenth capacitor C10 are connected in series, and the series branch formed is connected in parallel between the two poles of the power battery. The eleventh capacitor C11 is connected in parallel to both ends of the ninth capacitor C9, and the twelfth capacitor C12 is connected in parallel to both ends of the tenth capacitor C10.

[0139] The above is only a specific implementation of the second filtering circuit 130. In practical applications, including but not limited to this, no specific limitation is made here, and it can be determined according to specific circumstances, all of which are within the protection scope of this application.

[0140] In this embodiment, by adding the second filter circuit 130, the stability of the voltage across the power battery can be ensured, thereby reducing the possibility of failure of the second conversion power supply, thereby improving the safety of the second conversion power supply.

[0141] Another embodiment of the present application provides another implementation of the second conversion power supply 250, and its specific structure is as follows: Fig.11 ( Fig.11 Only in Fig.10 As shown in the figure, this embodiment, based on the above embodiment, further includes: an eighth resistor R8, a ninth resistor R9, a thirteenth capacitor C13 and a fourteenth capacitor C14. The connection relationship between the components is as follows:

[0142] The control end of the switch tube M is connected to one end of the eighth resistor R8, and the connection point is connected to one end of the ninth resistor R9. The other end of the ninth resistor R9 is grounded, that is, the high voltage ground HGND. The other end of the eighth resistor R8 is connected to the signal output end OUT of the power chip 20.

[0143] One end of the thirteenth capacitor C13 is connected to the reference voltage pin VREF of the power chip 20, and the other end of the thirteenth capacitor C13 is grounded, that is, the high voltage ground HGND. One end of the fourteenth capacitor C14 is connected to the timing terminal RT / CT of the internal oscillator of the power chip 20, and the other end of the fourteenth capacitor C14 is grounded, that is, the high voltage ground HGND.

[0144] It should be noted that the functions of the reference voltage pin VREF of the power chip 20 and the timing terminal RT / CT of the internal oscillator of the power chip 20 are the same as those in the prior art and will not be described in detail here.

[0145] The above is only a specific implementation of the second conversion power supply. In practical applications, including but not limited to this, no specific limitation is made here and it can be determined according to the specific situation, all of which are within the protection scope of this application.

[0146] For the above description of the disclosed embodiments, the features recorded in each embodiment in this specification can be replaced or combined with each other, so that professionals in the field can implement or use the present application. The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with a preferred embodiment, it is not used to limit the present invention. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A vehicle, characterized in that: include: Motor controller, battery, power supply, motor and vehicle controller; among which: The two poles of the input end of the first conversion power supply in the motor controller are respectively connected to the two poles of the battery; The output end of the first conversion power supply and the output end of the power supply are both connected to the power supply end of the vehicle controller; The output end of the motor controller is connected to the power supply end of the motor.

2. The vehicle according to claim 1, characterized in that Also includes: The second conversion power supply; wherein: The two poles of the input end of the second conversion power supply are connected to the two poles of the power battery in the vehicle; Two poles of the output end of the second conversion power supply are connected to two poles of the input end of the first conversion power supply.

3. The vehicle according to claim 2, characterized in that The second conversion power supply includes: a transformer, a power chip, a switch tube and two voltage stabilizing circuits; wherein: The power input pin of the power chip is connected to one end of the primary winding of the transformer, and the connection point is connected to the positive electrode of the power battery in the vehicle; the ground pin of the power chip is grounded; The other end of the primary winding is connected to the negative electrode of the power battery through the switch tube, and the negative electrode of the power battery is grounded; The signal output end of the power chip is connected to the control end of the switch tube, and the power chip is used to control the switch tube to be alternately turned on and off when the power chip is in a working state; Two ends of the first secondary winding of the transformer are respectively connected to a power input pin and a ground pin of the power chip; Two ends of the second secondary winding of the transformer are respectively connected to two poles of the input end of the first conversion power supply in the motor controller in the vehicle; The first voltage stabilizing circuit is arranged between two ends of the first secondary winding, and the second voltage stabilizing circuit is arranged between two ends of the second secondary winding.

4. The vehicle according to claim 3, characterized in that Also includes: Current sampling circuit; wherein: The current sampling circuit is used to sample the current of the primary winding and transmit the sampling result to the primary current detection pin of the power chip; The power chip is used to perform fault detection on the second conversion power supply according to the current of the primary winding.

5. The vehicle according to claim 4, characterized in that The current sampling circuit comprises: a first sampling resistor and a first filtering circuit; wherein: The first sampling resistor is connected in series with the switch tube, one end of the first filter circuit is connected to: the connection point between the first sampling resistor and the switch tube, and the other end of the first filter circuit is connected to the primary current detection pin of the power chip.

6. The vehicle according to claim 3, characterized in that Also includes: Voltage sampling circuit; wherein: The voltage sampling circuit is used to sample the voltage at both ends of the second secondary winding and transmit the voltage sampling result to the output voltage feedback pin of the power chip; The power chip is used to perform negative feedback adjustment on the duty cycle of the alternating on and off of the switch tube according to the voltage sampling result, so as to stabilize the voltage at both ends of the second secondary winding at a set voltage.

7. The vehicle according to claim 6, characterized in that The voltage sampling circuit includes: a second sampling resistor, a third sampling resistor, a controllable voltage stabilizing source, an optical coupler, a first capacitor, a first resistor, a second resistor, and a third resistor; wherein: One end of the second sampling resistor is connected to the high potential end of the second secondary winding, and one end of the third sampling resistor is grounded; The other end of the second sampling resistor is connected to the other end of the third sampling resistor, and the connection point is connected to the reference electrode of the controllable voltage-stabilizing source; The cathode of the controllable voltage-stabilizing source is connected to the output end of the primary side of the optocoupler, the input end of the primary side of the optocoupler is connected to the high potential end of the second secondary winding through the first resistor, and the anode of the controllable voltage-stabilizing source is grounded; The second resistor is connected in parallel with the primary side of the optocoupler; One end of the first capacitor is connected to: a connection point between the second sampling resistor and the third sampling resistor, and the other end of the first capacitor is connected to: an output end of the primary side of the optocoupler; The input end of the secondary side of the optical coupler is connected to one end of the third resistor, and the connection point is connected to the output voltage feedback pin; The other end of the third resistor receives the supply voltage, and the output end of the secondary side of the optocoupler is grounded.

8. The vehicle according to any one of claims 3 to 7, characterized in that Also includes: An absorption circuit and a first protection circuit; wherein: The absorption circuit is used to absorb the peak voltage generated by the switch tube at the moment of shutting down; The first protection circuit is used to absorb the overvoltage at both ends of the switch tube.

9. The vehicle according to any one of claims 3 to 7, characterized in that: Also includes: A starting resistor and a third voltage stabilizing circuit; wherein: The power input pin of the power chip is connected to one end of the primary winding of the transformer through the starting resistor; The input end of the third voltage stabilizing circuit is connected to the power input pin, and the output end of the third voltage stabilizing circuit is connected to the ground pin.

10. The vehicle according to any one of claims 3 to 7, characterized in that Also includes: A current limiting resistor, a first anti-reverse circuit, a second anti-reverse circuit and a second protection circuit; wherein: The power input pin is connected to the output end of the first anti-reverse circuit through the current limiting resistor, and the input end of the first anti-reverse circuit is connected to the high potential end of the first secondary winding; The second protection circuit is connected in parallel with the first anti-reverse circuit; The second protection circuit is used to absorb the overvoltage between the two ends of the first anti-reverse circuit; The input end of the second anti-reverse circuit is connected to the high potential end of the second secondary winding, and the output end of the second anti-reverse circuit is connected to the positive electrode of the input end of the first conversion power supply.

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